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2. ARCTIC:

Scientists point to a methane eruption as cause of Siberian hole mystery

It was aliens, or maybe a meteorite or a gas explosion. Those were some of the initial explanations for why three sinkhole-like craters gaped open in the Siberian permafrost, spawning a wave of Internet speculation. Now, some scientists who have visited the holes, or have just monitored them via media reports, say there may -- with an emphasis on may -- be a warming component to their formation.

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